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A076001 (1/2)*A075998. 1

%I #2 Mar 30 2012 18:57:04

%S 1,3,4,30,24,168,288,1080,1920,12672,8640,131040,161280,414720,774144,

%T 10575360,8294400,36771840,69672960,383201280,729907200,4578508800,

%U 2043740160,45287424000,65213890560,180592312320,347807416320

%N (1/2)*A075998.

%e a(6) = (1/2)*<6/1>*<6/2>*<6/3>*<6/4>*<6/5>*<6/6> = (1/2)*7*4*3*1*2*2 = 168, where <x> denotes the integer second-nearest to x, as defined at A075998.

%Y Cf. A075998 (product of second-nearest integers), A010786 (product of [n/k], k=1, 2, ..., n).

%K nonn

%O 1,2

%A _Clark Kimberling_, Sep 29 2002

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Last modified March 29 11:14 EDT 2024. Contains 371278 sequences. (Running on oeis4.)